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fix use of arg in ltn documentation

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This commit is contained in:
Pierre Chapuis
2013-01-23 19:03:46 +01:00
parent d548a78e55
commit eea1bc04d7
2 changed files with 7 additions and 5 deletions
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6
ltn012.wiki
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@ -126,8 +126,9 @@ local function chain2(f1, f2)
end
function filter.chain(...)
local arg = {...}
local f = arg[1]
for i = 2, table.getn(arg) do
for i = 2, #arg do
f = chain2(f, arg[i])
end
return f
@ -235,9 +236,10 @@ end
We can make these ideas even more powerful if we use a new feature of Lua 5.0: coroutines. Coroutines suffer from a great lack of advertisement, and I am going to play my part here. Just like lexical scoping, coroutines taste odd at first, but once you get used with the concept, it can save your day. I have to admit that using coroutines to implement our file source would be overkill, so let's implement a concatenated source factory instead.
{{{
function source.cat(...)
local arg = {...}
local co = coroutine.create(function()
local i = 1
while i <= table.getn(arg) do
while i <= #arg do
local chunk, err = arg[i]()
if chunk then coroutine.yield(chunk)
elseif err then return nil, err